Testing -6 alternator/regulator in car?, Yep I tried searching but maybe I suck at that... Options

[campbellcj]

Hi All -

I'm fairly sure my alternator (-6) just crapped-out and want to confirm that's the problem. Very abruptly my dash voltmeter dropped to around 10-11V when running, regardless of revs, vs the normal 13.8 or whatnot.

The battery did not seem to be charging, but was just about 5 yrs old so I replaced it, however no change in the voltmeter reading. All wiring and grounds look intact, same as before the issue started. The car starts and runs normally with a charged battery.

Is there an easy way to confirm it is or isn't the alternator with the engine still in the car?

Thanks!